A relative of a coronavirus victim in China is demanding to meet a visiting World Health Organization expert team, saying it should speak with affected families who allege they are being muffled by the Chinese government.

China approved the visit by researchers under the auspices of the U.N. agency only after months of negotiations. It has not indicated whether they will be allowed to gather evidence or talk to families, saying only that the team can exchange views with Chinese scientists.

The WHO team, which arrived in Wuhan on January 14 to investigate the origins of the virus, is expected to begin field work later this week after a 14-day quarantine.